Question

Cat este diferenta celor doua sume  (1+2+3+...56)-((1+2+3+...+36) ?

Answer 1

1+2+3+...+56=56*57:2=1596
1+2+3+...+36=36*37:2=666


(1+2+3+...+56)-(1+2+3+...+36)=1596-666=930

Answer 2

(1+2+3+......+56)=56x57:2=1596
1+2+3+.....+36=36x37:2=666
1596-666=930